I could be wrong, but I think Fukishima could release all the water at once and it’s effect on the ocean would be negligible.
Not in the immediate area it wouldn’t be. I think their plan sounds very reasonable.
A million tons of water in the Pacific Ocean is a rounding error.
The solution is simple.
Pump the contaminated water into an oil tanker. Pull up to a drilling ship used for oil exploration. Transfer the water to the drill ship and have it released on the abyssal plain of the Pacific which is about 17000 feet. The incredible slow turn over of deep waters to the surface will insure that all the radioactive elements will be harmless when they reach the surface 1000s of years later.
The death rates will tell if true.